Door lock



N. A. WELCH Nov. 13, 1956 DOOR LOCK 2 Sheets-Shee Filed Jan. 27, 1955 mmvron lV/CHOLRS f7. WELCH 04.4% z/mw;

N. A. WELCH DOOR LOCK 2 Sheets-Shae Nov. 13, 1956 Filed Jan. 27, 1955 noon Lock Nicholas A. Welch, West Hartford, Conn., assignor to The American Hardware Corporation, New Britain, Conn., a corporation of Connecticut Application January 27, 1955, Serial No. 484,407

17 Claims. (Ci. 70-446) This invention relates to a door lock and more particularly to a door 'lock of the cylindrical type, and constitutes an improvement over the structures disclosed in United States Patents No. 2,694,916, dated November 23, 1954, and No. 2,702,466, dated February 22, 1955.

The term cylindrical lock is generally applied to door locks which include two separate units, that is, an operating unit and a latch unit. The operating unit extends through a hole in the face of the door and contains a retractor mechanism which is operable from the inner and the outer sides of the door. The latch unit is disposed in a hole extending into the edge of the door at right angles to the axis of the operating unit and is attached to the case of the operating unit. Said latch unit contains a latch belt which is connected to the retractor of the operating unit and is withdrawn thereby. Door locks having different locking characteristics can be provided by adding other elements to the basic operating unit.-

The cylindrical lock embodying the present invention is particularly adapted for use on the doors of bedrooms and bathrooms and contains means which are operable from the inner side of the door to render the outer door knob inoperative. In addition, said lock also includes emergency release means operable from the outer side of the door when the outer knob is dogged for releasing the dogging means to permit operation of the outer door knob, and it is this portion of the mechanism to which the instant invention is particularly directed.

The primary object of the present invention is to provide emergency release means in a cylindrical lock of the type disclosed which are much easier to operate than the emergency release mechanisms disclosed in the above mentioned patents.

Further objects and advantages of this invention will be more clearly understood from the following description and from the accompanying drawings in which:

Fig. l is a plan View, partly in central horizontal section, illustrating the operating unit of the cylindrical lock embodying my invention and showing the dogging mechanism thereof in normal undogging position.

Fig. 2 is a sectional end view of said operating unit taken substantially on line 2-2 of Fig. 1.

Fig. 3 is a similar view taken on line 3-3 of Fig. 1.

Fig. 4 is an isometric view of the spindle uni-t forming part of the dogging mechanism in said operating unit.

Fig. 5 is an end view of the retractor of said operating unit illustrating the spindle retaining fingers carried thereby.

Fig. 6 is a plan view of said retra-ctor with portions thereof broken away to illustrate the manner in which the spindle retaining fingers are attached thereto.

Fig. 7 is a view similar to Fig. 1, but illustrating the position of the dogging mechanism when the outer door knob is dogged against operation.

Fig. 8 is a fragmentary isometric view illustrating the manner in which the spindle unit is retained in dogging position by the retaining fingers on the retractor.

Patented Nov. 13, ESE?) Fig. 9 is a sectional end view taken on line 9-9 of Fig. 7.

Fig. 10 is a view similar to Fig. 3, with parts omit-ted, illustrating the manner in which the retaining fingers on the retractor are disengaged from the spindle unit to permit movement of the dogging mechanism to undogging position.

Fig. 11 is a fragmentary plan View, partially in central horizontal section, illustrating the dogging mechanism when in the position shown in Fig. 10, wherein the retaining fingers on the retractor have just been disengaged from the spindle unit.

The operating uni-t of the cylindrical lock embodying the instant invention and illustrated in the drawings includes a case 5 comprising a cylindrical cupshaped member 6 land a cover 7. Inner and outer tubular sleeves 8 and 9 ext-end coaxially from the cover 7 and the outer end wall of the cup-shaped member 6, and each of said sleeves has a reduced end portion which extends into the interior of the case.

The case 5 contains a subframe 11 which carries guide members 12- 12 that slidably support a retractor 13 which consists of a U-shaped member 14 having side plates 15- 15 secured to the opposite sides thereof which straddle the guide members 12-12 to slidably retain the retractor thereon as illustrated in Fig. 3 and as fully disclosed in United States Patent No. 2,721,095, dated October 18, 1955. Retractor springs 13a 13a urge the retractor 13 into its normal extended position.

The sleeves 8 and 9 rotatably support inner and outer knob shanks 16 and 17 which are retained against axial movement within the sleeves by locking bars 18 and 19 as fully disclosed in United States Patent No. 2,701,160, dated February 1, 1955, and said shanks 16 and 17 carry door knobs 20 and 21 which are secured thereto in the manner fully described in United States Patent No. 2,675,692, dated April 20, 1954.

The ends of the sleeves 8 and 9, which extend into the case 5, have enlarged bores which receive rotatable connectors 22 and 23 that are operatively connected to their respective knob shanks 16 and 17 by tongue and slot 'connections as illustrated at 24; said connectors being fully disclosed in United States Patent No. 2,723,150 of Ernest L. Teich, dated November 8, 1955. The annular Wall of each of the connectors contains diametrically opposed notches 2525 which receive the straight shank of rollback members 26 and 27 that operatively engage the roll-back platforms 1'5-a15a which extend from each side of the retractor as illustrated in Figs. 5 and 6 and in dotted lines in Fig. 3. The annular portion of the outer sleeve 9 which extends into the interior of the case 5 is also provided with diametrically opposed notches 2828 which are normally in alignment with the notches 25-25 in the connector 23 and are adapted to receive the shank 27-a of the outer rollback 27 for a purpose to be hereinafter more fully described. Each of the rollbacks 26 and 27 has an enlarged circular portion, 26-a and 27-h, respectively, intermediate the ends of its shank which is contained within its respective connector and supports said rollback therein.

*It will be understood from the above description of the basic operating unit that when either of the knobs 20 or 21 is rotated, it will rotate its respective rollback which will cause rearward movement of the ret-ractor along the guide members 1 212 against the force of the springs 13a13-a.

It is well known to those familiar with this type of door lock that the latch bolt of the latch unit is provided with a retractor bar, illustrated in dotted lines at 134), which is adapted to be connected to the retra'ctor so that upon retraction of the retractor by operation of the inner or the outer knob of the operating unit, the latch bolt will be withdrawn. Upon release of the knob, the retraoator springs will return the mechanism to normal position.

In order to dog the outer knob against rotation, it is necessary to move the outer rollback 27 axially in the connector 23 until the shank 27-a of said rollback is disposed within the notches 28-28 in the outer sleeve 9. When the rollback is in this position, its rotation is prevented by the sides of the notches 28-28 and consequently rotation of the connector 23, the outer knob shank 17 and the outer knob 21 is prevented.

The means employed for controlling the movement of the rollback 27 into and out of dogging position include a pushbutton 29 that is slidably mounted in an opening 30 in the front wall of the inner knob 20 and has secured thereto an extension member 31 having a circular foot portion 31-a bent at right angles thereto and slidably disposed within the shank 16. A light compression spring 32 urges the pushbutton toward depressed position.

A two-piece spindle unit, indicated generally at 33, is

supported axially of the knob shanks 16 and 17 by the rollbacks 26 and 27 and extends through a clearance slot 34 in each of the side plates 15-15 of the retractor. The inner spindle section 35 is cylindrical in cross'section and extends through an axial opening in the rollback 26; the end of said spindle section adjacent the rollback 26 beingprovided with an annular flange 36 having a tapered annular surface 36-a and forming a I shoulder 36-]; which is adapted to abut the surface of the rollback 26. The said inner spindle section contains an axial hole 37, and its inner free end is normally engaged by the foot 31a on the pushbutton 29 under the influence of the spring 32.

The outer spindle section 38 includes a flat head portion 39 having stems 40 and 41 extending coaxially from the opposite ends thereof. The inner stem 40 projects into the hole 37 in the inner spindle section" and into engagement with a compression spring 42 which is contained within said hole. The outer stem 41 projects through a hole in the outer rollback 27 and has a tubular sleeve 43 pinned thereto; said sleeve having diametrically opposed longitudinally extending slots 44-44 in the wall thereof.

In order to accomplish its intended purpose, means must be provided in the operating unit for rotating the outer spindle section 38. The means which i have elected to show in the accompanying drawing include a conventional key operated cylinder lock 46 having an extension 47 on the rotatable key plug thereof to which a shaft 43 is secured by means of a pin 49. The shaft 48 extends into the sleeve 43 of the outer spindle section 33 and carries a drive pin 50 which extends through the end of the shaft 48 and into the slots 4444 in said sleeve. A washer 51 is retained on the shaft 48 by a snap ring 52 and provides an abutment for one end of a compression spring 53; the opposite end of which engages the outer rollback 27 and urges it against the shoulder 39-a formed by the outer end of the head 39.

The compression spring 53 urges the outer rollback, the inner and the outer spindle sections and the pushbutton 29 into normal position as illustrated in Fig. 1. The force exerted by the spring 53 is transmitted to the inner spindle section 35 through the compression spring 42, but said spring is substantially stifier than the spring 53 and thereby normally retains the inner and the outer spindle sections in fully extended position. Inward movement of the spindle sections is limited by the engagement of the shoulder 36-b on the inner spindle section with the inner rollback 26 which is retained against axial movement by the retractor on one side and, on the other, by a spacer ring 54 which is disposed around the connector 22.

The head 39 on the outer spindle section 38 normally lies in a plane parallel to the direction of movement of the retractor and is disposed between a pair of retaining fingers 5555 which are pivotally mounted on the retractor and within the U-shaped member 14 thereof by means of ears 56-56 which extend laterally into notches 57-57 in the side plates 1515 of the retractor and which ears are retained in said notches by the inwardly extending fingers 14-a14a on said retractor. The retaining fingers 5555 are provided with notches 53 in their free ends and are urged together about their pivot points and into engagement with the opposite sides of the head 39 by means of a U-shaped spring member 59 which is contained within the member 14 and between the side plates 1515 thereon as clearly shown in the drawings.

It will be understood that when the dogging mechanism, including the outer rollback 27, is in the position illustrated in Figs. 1 and 3, operation of either the inner knob 20 or the outer knob 21 will, through rotation of its respective rollback, cause retraction of the retractor and withdrawal of the latch bolt attached thereto. Rearward movement of the retractor will merely cause the fingers 5555 to slide over the opposite flat sides of the head 39 without interference. Since the retractor fingers 14a-14a on the retractor are received in notches 13-c13c in the latch bolt retractor bar 13-h, it will be understood that depression of the latch bolt, such as would occur as the latch bolt engages the strike when the door is closed, will also cause rearward movement of the retractor, but that upon this occurrence the fingers 55-55 will again merely slide over the head 39 without interfering with the movement of the retractor.

When it is desired to dog the outer knob 21 against operation, so as to prevent of the door lock from the outer side of the door, the pushbutton 29 is depressed. This will move the inner and the outer spindle sections 35 and 38 and the outer rollback 27 simultaneously against the force of the compression spring 53; relative movement between the inner and the outer spindle sections being prevented because the compression spring 42 is stiffer than the spring 53. The continued move ment of the spindle unit will move the straight shank 27 a of the outer rollback relatively to the connector 23 and into the notches 2828 in the sleeve 9 as illustrated in Fig. 7. When the rollback engages the bottoms of the notches 2525 in the connector 23, further movement of the outer spindle section is then prevented, but the inner spindle section can and does continue to move independently of the outer section and against the spring 42 so that the tapered surface 36-a on the head 36 of the inner spindle section will engage the edges of the retaining fingers 55-55 and spread the fingers apart to permit the head to pass therebetween. When the shoulder 36b comes into alignment with the inner sides of the notches 58 in said fingers, the spring 59 will then urge said fingers inwardly to position the sides of said notches S8 behind said shoulder to thereby retain the spindle in dogging position, as illustrated in Fig. 7, wherein rotation of the outer knob shank is prevented. It will be understood that the pushbutton is retained in depressed position by the light spring 32 which urges the pushbutton into the inner knob 20 and causes the foot 31-a thereon to remain against the end of the inner spindle section. During movement of the outer spindle section to dogging position, the sleeve 43 thereon will slide over the shaft 48.

Since the inner rollback 26 is not affected when the outer knob is dogged against operation, the door lock may be operated at any time by rotating the inner knob 20 which will retract the retractor and carry the retaining fingers 55-55 rearwardly relatively to the annular flange 36 on the inner spindle section disposed therebetween. When the forward edges of the notches 58 in said fingers engage the periphery of said flange 36, the fingers will be cammed apart and will be disengaged from the shoulder 36b whereupon the spring 53 will return the entire dogging mechanism to normal position illustrated in Fig. l and the spring 42 will urge the spindle section's to fully extended position. If the pushbutton should accidentally be depressed while the door is open, the dogging mechanism will be released upon depression of the latch bolt when the door is closed in the manner just described to thereby prevent accidental locking of the outer door knob.

If the outer knob is dogged against operation, wherein the mechanism is in the position illustrated in Fig. 7, and it is desired to open the door from the outer side thereof, the proper key is inserted into the key plug of the cylinder lock and said key plug is rotated in either direction. This will, in turn, rotate the shaft 48 and through the drive pin 50 rotate the sleeve 43 and the outer spindle section 38 relatively to the outer rollback and the inner spindle section 35. Rotation of the outer spindle section will, as illustrated in Figs. and 11 rotate the head 39 thereon and said head will urge the retaining fingers 5555 apart against the spring 59 and disengage them from the shoulder 36-12 on the inner spindle section whereupon the spring 53 Will urge the outer rollback out of the notches 28-28 and will return the entire dogging mechanism to normal position having the outer knob free to operate. When the key is returned to normal position, the head 39 and the fingers 5555 will also be returned to their normal position.

.i claim:

1. In a door lock, a retractor for a latch bolt, an inner and an outer operating member for actuating said retractor, dogging means for dogging said outer operating member against operation, retaining means operable independently of said retractor and adapted to engage said dogging means when moved to dogging position and to retain said dogging means in dogging position, rotatable means operable from the outer side of the lock when the outer operating member is dogged and adapted upon rotation thereof to engage and shift said retaining means out of engagement with said dogging means, and means for moving said dogging means to undogging position upon the release thereof.

2. In a door lock, a retractor for a latch bolt, an inner and an outer operating member for actuating said retractor, dogging means for dogging said outer operating member against operation, retaining means carried by said retractor and movable relatively thereto; said retaining means being adapted to engage said dogging means when moved to dogging position and to retain said dogging means in dogging position, rotatable means operable from the outer side of the lock when the outer operating memher is dogged and adapted upon rotation thereof to engage and shift said retaining means out of engagement with said dogging means, and means for moving said dogging means to undogging position upon the release thereof.

3. In a door lock, a retractor for a latch bolt, an inner and an outer operating member for actuating said retractor, dogging means for dogging said outer operating member against operation, a movable spindle member operable from the inner side of the lock and adapted to shift said dogging means for undogging to dogging position, retaining means movable independently of said retractor and engageable with said spindle member when moved to dogging position for retaining said spindle member and said dogging means in dogging position, rotatable means operable from the outer side of the lock when the outer operating member is dogged and adapted, upon rotation thereof, to engage and shift said retaining means out of engagement with said spindle member, and means for moving said dogging means and said spindle member to undogging position upon the release thereof.

4. In a door lock, a retractor for a latch bolt, an inner and an outer operating member for actuating said retractor, dogging means adapted to dog the outer operating member against operation, a longitudinally movable spindle member operable from the inner operating member and extending through said operating members and said retractor; said spindle member being adapted to bodily shift said dogging means from undogging to dogging position, retaining means engageable with said spindle when moved to dogging position for retaining said spindle and said dogging means in dogging position; said spindle being rotatable from the outer operating member and having means thereon adapted to engage and bodily shift said retaining means out of engagement therewith, and means for returning said dogging means and said spindle member to undogging position upon the release thereof.

5. In a door lock, a retractor for a latch bolt, an inner and an outer operating member for actuating said retractor, dogging means adapted to dog the outer operating member against operation, a longitudinally movable spindle member operable from the inner operating member and extending through said operating members and said retractor; said spindle member being adapted to move said dogging means from undogging to dogging position, retaining means carried by said retractor and engageable with an abutment on said spindle member when moved to dogging position for retaining said spindle and said dogging means in said position; said spindle being rotatable from the outer operating member and having means thereon adapted to engage and bodily shift said retaining means out of engagement with said abutment, and means for returning said dogging means and said spindle to undogging position upon release thereof.

6. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member for actuating said retractor, dogging means adapted to dog the outer operating member against operation, a pair of opposed retaining fingers pivotally carried on said retractor, means resiliently urging said fingers together, a rotatable and longitudinally movable spindle unit extending through said operating members and between the fingers on said retractor and being adapted to move said dogging means into dogging position, means accessible from the inner operating member for moving said spindle unit longitudinally to urge said dogging means into dogging position, cooperative abutment means on said spindle unit and said retaining fingers for retaining said spindle unit and said dogging means in dogging position, a head on said spindle unit disposed between said fingers, and means accessible at the outer operating member for rotating said spindle unit; said head being adapted, upon rotation, to disengage the fingers from said spindle unit to permit movement of it and said dogging means to undogging position.

7. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member for actuating said retractor, dogging means for dogging the outer operating member against operation, a longitudinally movable spindle unit extending through said operating members and said retractor and including relatively movable inner and outer sections, the outer section being adapted to move said dogging means, means operable through the inner operating member for moving said spindle unit longitudinally to carry said dogging means into dogging position, retaining means engageable with the inner spindle section for retaining said spindle unit and said dogging means in dogging position; means accessible at the outer operating member for rotating said outer spindle section, and means on said outer spindle section adapted, upon rotation thereof, to release said re taining means to permit movement of said spindle unit and said dogging means out of dogging position.

8. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member for actuating said retractor, a dogging member for dogging said outer operating member against operation, a longitudinally movable spindle unit extending through said operating members and said retractor and including an inner and an outer section which are movable axially with respect to one another, resilient means urging said spindle sections apart; said outer spindle section being adapted to move said dogging member, means accessible from the inner operating member for moving said spindle unit longitudinally to urge said dogging means into dogging position, retaining means engageable with the inner spindle section upon further movement thereof independently of said outer section and against said resilient means for retaining said spindle and said dogging means in dogging position, means accessible at the outer operating member for rotating the outer spindle section, and means on said outer spindle section adapted, upon rotation thereof, to release said retaining means to permit movement of said spindle and said dogging member to undogging position.

9. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member for actuating said retractor, a dogging member for dogging said outer operating member against operation, a longitudinally movable spindle unit extending through said operating members and said retractor and including an inner and an outer section which are movable both axially and rotatably with respect to each other, resilient means urging said sections apart; the outer section being adapted to move said dogging member, means operable through the inner operating member for moving said spindle unit longitudinally to carry said dogging means into dogging position, means engageable with the inner spindle section upon further movement independently of said outer section and against said resilient means for retaining said spindle and said dogging member in dogging position, means accessible at the outer operating member for rotating said outer spindle section, and means on said outer spindle section adapted, upon rotation thereof, to disengage said retaining means from the inner spindle section to permit movement of said pindle unit and said dogging member to undogging position.

10. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member for actuating said retractor, a dogging member for dogging said outer operating member against operation, a pair of opposed pivotally mounted retaining fingers on said retractor, means ur ing said fingers together, a longitudinally movable and rotatable spindle extending through said operating members and between the fingers on said retractor and being adapted to move said dogging member; said spindle having an annular flange thereon providing an abutment shoulder, means operable through the inner operating member for moving said spindle unit longitudinally to carry said dogging member into dogging position wherein the abutment shoulder on said inner spindle section is engaged by said retaining fingers to retain said spindle and said dogging member in dogging position, a fiat head member on said spindle having a width greater than the diameter of said flange and disposed between said fingers when the spindle is in dogging position, and means accessible through the outer operating member for rotating said spindle to cause said head to spread and disengage said fingers from said abutment shoulder to permit movement of said spindle and said dogging member to undogging position.

11. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer operating member-for actuating said retractor, a dogging member for dogging said outer operating member against operation, a pair of opposed retaining fingers pivotally mounted upon said retractor and having oppositely disposed notches therein, spring means urging said retaining fingers together, a longitudinally movable spindle unit extending through said operating members and said retractor and including an inner and an outer section, spring means between said spindle sections urging them apart; said inner section having a flange thereon with a tapered surface adjacent said fingers and providing an abutment shoulder, a head on said outer section normally disposed between said retaining fingers and being of a Width that is greater than the diameter of said flange; said outer spindle section being adapted to move said dogging member and being rotatable relatively thereto, means operable through the inner operating member for moving said spindle unit and said dogging member into dogging position wherein further longitudinal movement of said dogging member and said outer spindle section is prevented; said inner spindle section being adapted to move independently of said outer section and against the spring means therebetween to cause the tapered surface of said flange to spread said retaining fingers to permit entryof said flange therebetween and into said notches to thereby retain said spindle unit and said dogging member in dogging position, means accessible through the outeroperating member for rotating said outer spindle section to cause the head thereon to spread said retaining fingers and disengage them from the abutment shoulder on said flange, and spring means operable to move said dogging member and said spindle unit to undogging position upon the release of said retaining means.

12. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback for operating said retractor, an inner and an outer operating member for rotating its respective rollback to actuate said retractor; said outer rollback being axially movable relatively to its operating member, abutment means engageable by said outer rollback to prevent rotation thereof, means operable from the inner operating member for moving said outer rollback into engagement with said abutment means to thereby dog the outer operating member against operation, retaining means for retaining said outer rollback in engagement with said abutments and rotatable means operable from the outer operating member and adapted, upon rotation, to release said retaining means to permit movement of the rollback out of engagement with said abutments.

13. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback for operating said retractor, an inner and an outer oper ating member for rotating its respective rollback to actuate the retractor; said outer rollback being axially moviable relatively to its operating member, abutment means engageable by said outer rollback when in dogging position to prevent rotation thereof, a longitudinally movable member operable from the inner operating member for moving said outer rollback into engagement with said abutments to prevent rotation thereof and of the outer operating member, retaining means engageable with said longitudinally movable member for retaining it and said outer rollback in dogging position, and rotatable releasing means operable from the outer operating member for disengaging said retaining means from said longitudinally movable member to permit movement of the outer rollback out of engagement with said abutments.

14. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback, an inner and an outer operating member for rotating its respective rollback to actuate said retractor; said outer rollback being axially movable relatively to its operating member, abutment means adapted to be engaged by said outer rollback, a longitudinally movable spindle extending through said operating members and said outer rollback and being adapted to move said outer rollback, means accessible from the inner operating member for moving said spindle to carry the outer rollback into engagement with said abutrnents whereby rotation of said rollback and said outer operating member is prevented, retaining means engageable with said spindle for retaining it and said outer rollback in dogging position, means on said spindle adapted to disengage said retaining means therefrom, and means operable from the outer operating member for rotating said spindle to cause operation of said disengaging means.

15. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback, an inner and an outer operating member for rotating its respective rollback to actuate said retractor; said outer rollback being axially movable relatively to its operating member, abutment means adapted to be engaged by said outer rollback to prevent rotation thereof and to dog its operating member against operation, a pair of oppositely disposed retaining fingers mounted upon said retractor, means urging said fingers together, a rotatable and longitudinally movable spindle unit extending through said operating members and between the fingers on said retractor; said spindle having a flange thereon normally disposed adjacent said fingers and a flat head portion of a width greater than the diameter of the flange and forming a shoulder abutting said outer rollback, means operable from the inner operating member for moving said spindle unit longitudinally to carry said outer rollback into engagement with said abutment means and said flange into engagement with said fingers whereby the said spindle and rollback are retained in dogging position; said head being disposed between said fingers, means accessible at the outer operating member for rotating said spindle to cause said head to spread and disengage said retaining fingers from said flange and means urging said rollback and said spindle to normal undogg'ing position.

16. A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback, an inner and an outer operating member for rotating its respective rollback to actuate said retractor; said outer rollback being axially movable relatively to its operating member, abutment means adapted to be engaged by said outer rollback to prevent rotation thereof and to dog the outer operating member against operation, a longitudinally movable spindle unit extending through said operating members and said retractor and including relatively movable inner and outer sections; said outer section being adapted to move said outer rollback, resilient means urging said spindle sections apart, means accessible from the inner operating member for simultaneously moving said inner and outer spindle sections longitudinally to carry said outer rollback into engagement with said abutment means, retaining means engageable with the inner spindle section upon further movement thereof independently of said outer section and against said resilient means for retaining said spindle unit and said rollback in dogging position, means accessible at the outer operating member for rotating the outer spindle section, means on said outer spindle section adapted, upon rotation thereof, to release said retaining means, and means for returning said outer rollback and said spindle unit to undogging position.

17, A door lock comprising a case, a retractor for a latch bolt in said case, an inner and an outer rollback, an inner and an outer operating member for rotating its respective rollback to actuate said retractor; said outer rotating rollback being movable axially relatively to its operating member, abutment means adapted to be engaged by said outer rollback to prevent rotation thereof and to dog its operating member against operation, a pair of opposed retaining fingers pivotally mounted upon said retractor, said fingers being resiliently urged towards one another, a longitudinally movable spindle unit extending through said operating members and between the fingers on said retractor and including an inner and an outer relatively movable section, spring means between said spindle sections urging them apart, said inner section having a flange thereon with a tapered surface adjacent said fingers, a head on said outer section normally disposed between said retaining fingers and being of a width that is greater than the diameter of said flange and providing a shoulder on said outer spindle section adapted to abut said outer rollback, means operable through the inner operating member for simultaneously moving said spindle sections to carry said rollback into engagement with said abutment means wherein further longitudinal movement of said rollback and said outer spindle section is prevented; said inner spindle section being adapted to move independently of said outer section and against the spring means therebetween to cause the tapered surface of said flange to spread said retaining fingers to permit engagement thereof with said flange whereby the spindle unit and the outer rollback :are retained in dogging position, means accessible through the outer operating memher for rotating the outer spindle section to cause the head thereon to spread said retaining fingers and disengage them from the flange, and spring means operable to move said outer rollback and said spindle unit to undogging position upon the release of said retaining means.

References Cited in the file of this patent UNITED STATES PATENTS 2,018,093 Schlage Oct. 22, 1935 2,266,086 Schlage Dec. 16, 1941 2,293,856 Schlage Aug. 25, 1942 2,355,682 Schlage Aug. 15, 1944 

